cavern

A large natural space inside rock or under the ground.

• Bats live in the cavern.
• We explored several caverns beneath the mountain.
• Water dripped from the cavern’s ceiling.

Similar words: cave, grotto

Common phrases: limestone cavern, underground cavern, explore a cavern

A large room or hollow space below the ground.

• Gas is stored in this cavern.
• Engineers dug a cavern beneath the power station.
• The underground caverns hold emergency oil supplies.

Similar words: chamber

Common phrases: storage cavern, excavated cavern, salt cavern

A very large, dark room or space.

• The shop was a dark cavern.
• We waited in a cavern of a hall.
• His voice echoed through the empty cavern of the old theatre.

How to use it: a cavern of a + noun (They worked in a cavern of a warehouse.)

Common phrases: dark cavern, cavern of something

To make deep hollow spaces in something.

• Water caverned the rock.
• Ancient tunnels cavern the hillside.
• Waves had caverned the cliffs over many centuries.

Similar words: hollow out

Common phrases: cavern the rock, cavern a hillside